(单选题)46: I've got a ______ for you from Sir Robert Abbey. He's just been on the telephone. ( ) A: message B: words C: medal D: parcel ...

(单选题)40: We need （an extra） copy of the book for the newcomer. ( ) A: a rare B: an additional C: an unusual D: an excellent ...

(单选题)34: Identify the errors in the following sentence:My ninety-years-old grandmother was going to visit my family during the Christmas season. ( ) A: ninety-years-old B: to visit C: during D: season ...

(单选题)28: The atomic weight of helium is ______ that of hydrogen. () A: heavier four times than B: four time heavier than C: than four times heavier D: four times heavier than ...

(单选题)22: Identify the errors in the following sentence:I can’t help to think it would be fun to play such an exciting game with them. () A: to think B: would be C: to play D: an exciting ...

(单选题)16: Identify the errors in the following sentence:The scientist thinks it necessary that all the inventions of mankind must be used for good. ( ) A: thinks it B: mankind C: must D: for good ...

(单选题)10: Since he was a boy, one of his ______ has been stamp-collecting. ( ) A: hobbies B: proposals C: customs D: adventures ...

(单选题)4: You had better make ______ that she is at home before you call on her. ( ) A: secure B: assure C: safe D: sure ...

(单选题)98: 碱基A被碱基T替换属于??( ) A: 插入 B: 重排 C: 颠换 D: 缺失 E: 转换 ...

(单选题)92: DNA的合成原料是??( ) A: ADP、GDP、CDP、UDP B: ATP、GTP、CTP、UTP C: dADP、dGDP、dCDP、dTDP D: dAMP、dGMP、dCMP、dTMP E: dATP、dGTP、dCTP、dTTP ...